| All Patents in class 451/156 |
Patents 1 -
15
of 16
      |
| Number | Date | Patentee | Title | Type |
| 1,731,482 | Oct. 15, 1929 | L.F. Nenninger, H. Ernst | Spindle Oscillator | grinding machines |
| 1,783,019 | Nov. 25, 1930 | A.M. Johnson | Honing machine | honing machines |
| 1,872,746 | Aug. 23, 1932 | A.M. Johnson | Honing machine | honing machines |
| 1,877,881 | Sep. 20, 1932 | A.M. Johnson | Honing machine | honing machines |
| 1,920,290 | Aug. 01, 1933 | W.L. Bryant | Grinding machine or the like | grinders |
| 1,938,758 | Dec. 12, 1933 | H. Ernst | Spindle Oscillator | grinding machines |
| 2,000,614 | May 07, 1935 | E.G. Roehm | Grinding Machine | grinding machines |
| 2,006,570 | Jul. 02, 1935 | F.S. Haas | Grinding Machinery | grinding machines |
| 2,043,408 | Jun. 09, 1936 | E.F. Haas | Grinding Machine | grinding machines |
| 2,076,808 | Apr. 13, 1937 | W.L. Bryant | Grinding machines | grinders |
| 2,108,354 | Feb. 15, 1938 | F.A. Swanson | Blind end cylinder honing machine | |
| 2,130,393 | Sep. 20, 1938 | A.M. Johnson | Honing machine | honing machines |
| 2,167,758 | Aug. 01, 1939 | W.M. Fairbairn, A.M. Johnson | Method and machine for honing cylindrical surfaces | honing machines |
| 2,176,316 | Oct. 17, 1939 | F.A. Swanson | Honing machine | honing machines |
| 2,263,878 | Nov. 25, 1941 | A.M. Johnson | Honing machine | honing machines |
